Gas-lamp.



G. KEITH.

GAS LAMP.

APPLICATION FILED NOV. a, 1913.

1,100,434,, Patented June 16, 1914.

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l I fi v Geo/we dis/r y Jrrofimsy Cir UNITED STATES PATENT OFFICE.

GEORGE KEITH, OF LONDON, ENGLAND, ASSIGNOR OF ONE-HALF TO JAMES KEITH, OF LONDON, ENGLAND.

GAS-LAMP.

Specification of Letters Patent.

Patented June 16, 1914.

Application filed November 3, 1913. Serial No. 798,939.

To all whom it may concern:

Be it known that I, GEORGE KEITH, a subject of the King of the United Kingdom of Great Britain and Ireland, and residing at London, England, have invented a certain new and useful Improvement in Gas-Lamps,

of which the following is a specification.

This invention relates to inverted incandescent gas lamps and has for its primary objects to afford increased protection against overheating of the burner nozzle and also to provide a simplified arrangement for carrying the mantle.

In the specification of Letters Patent No. 91787 6 there is described a high pressure inverted incandescent gas lamp provided with a gas and air heater to which is fitted a nozzle of substantial cross section and composed of good conducting metal on which is closely fitted a non-conducting ring serving to support the mantle.

In accordance with the present invention the ring is spaced from the nozzle, 6. 9., is enlarged internally as well as externally, and supported from the underside of the heater, provision being made to prevent circulation of the burnt gases through the space thus formed between the ring and the nozzle.

Figure 1 of the accompanying drawing is a longitudinal vertical section of a gas lamp embodying the invention; Fig. 2 is a detail view to a larger scale.

Referring to the drawing, 1 denotes the nozzle of good conducting metal and substantial cross section located at the mouth of, and in thermal contact with, the gas and,

air heater 2; the said nozzle being preferably of substantially hemispherical form to insure adequate conduction of heat from the tip. A ring 3 of non-conducting material which desirably conforms in shape with the nozzle 6. 9., is shaped as a cup having a central aperture, is supported from the heater 2 by a screw-threaded connection or the like, so as to afiord between its inner wall and the outer wall of said nozzle a substantially annular space 4 closed at its upper end. With this construction the lower portion of the heater 2 is protected against overheating-a matter of importance by reason that an important function of the lower portion of the heater is to extract heat from the nozzle. The rlng 3 is preferably formed with an annular recess 5 adjacent to the boundary of the aperture.

The soft mantle 6, instead of being supplied with a non-conducting ring, as usual, is fitted with a light ring 7, preferably of suitable wire, sewn or attached to the upper end of the mantle fabric, the diameter of said ring 7 exceeding the diameter of the aperture in the ring 3.

To attach the mantle 6, it sufiices to unscrew the ring 8 from the heater'2, and drop the fabric through the aperture in said ring from above, the ring 7 being allowed to rest in the recess 5, the mantle being then formed and shaped in the usual. way, and the ring 3 replaced.

Apart from economical considerations involved in the substitution of a light ring for the usual non-conducting mantle ring, the mantle suspension above described presents the advantage that in the selection of a mantle the user is not limited to the employment of mantles having a diameter at the upper end exceeding that of the bore of the nozzle, but may employ a mantle of any practicable diameter. The top of the mantle being exposed directly to the flame is hardened more satisfactorily than it is in the case where it is fixed on the outside of an ordinary mantle ring and so shielded from the flame. With the present arrangement, therefore, the use of a hardening liquid may be dispensed with.

I claim 1. In an inverted incandescent gas lamp, in combination, a gas and air heater, a metallic nozzle of substantially hemispherical form in thermal contact with said heater, and a cup-shaped mantle-supporting ring of non-conducting material, the lower extremity of said ring extending below the lower end of said nozzle, said ring being fitted to said heater and affording between its inner wall and the outer wall of said nozzle a space closed at its upper end.

2. In an inverted incandescent gas lamp, in combination, a heater, a nozzle in thermal contact with. said heater and a mantle-supporting ring fitted to said heater and partially inelosing said nozzle, the lower eX- In testimony whereof I have signed my tremity of said ring extending below the name to this specification in the presence of lower end of said no'z'zle, said ring being in two subscribing witnesses. the form of a cup having at its lower end a GEORGE KEITH.

0 central aperture provided in its interior face Witnesses:

with an annular recess adjacent to the M. BURMINGI-IAM, boundary of said aperture. J. V. HAMPSHIRE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, 7 Washington, D. G. 

